html, body {
    padding: 0;
    margin: 0;
}

body {
    background-color: #00f;
    color: #fff;
}

ul, li {
    list-style: none;
    padding: 0;
}

flex-div{
    display: flex;
}
.logo{
    display: block;
    width: 540px;
    height: 258px;
    background: url('../images/bd_logo1.png')
}
